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Coarse Crinoidal Packstones and Grainstones
Locally interbedded with the gray-green shales that cap most Fort Payne buildups are tabular, crinoidal packstone-grainstone beds that range in thickness from less than 1 to 12 inches. These beds are laterally continuous at outcrop scale, and are sparsely distributed vertically through the capping or flanking gray-green shale. Grainstone beds are sharp-based. Often, the crinoidal grainstone beds are closely associated with fossiliferous stringers of green shale, and it is not uncommon for them to grade into each other (Krause and Meyer, 2004).
Figure 1. Typical appearance of crinoidal packstones and grainstones around Fort Payne mud mounds.
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